机载FMCW SAR系统分析设计与ADS仿真

Analysis and Design of FMCW SAR System with ADS Simulation

摘要:

在调频连续波（FMCW）合成孔径雷达（SAR）系统中，由于连续收发信号而引起收发隔离与功率确定的问题，在分析系统特点基础上，首先确定了系统结构，而后对馈通信号的滤除、数据存储速率和发射功率的确定问题进行讨论，给出设计方法；针对系统参数杂乱且相互关联，不易于系统设计的开展与梳理的问题，围绕成像分辨率、场景宽度和数据存储率等性能指标，对系统参数进行分解设计，提出了FMCW SAR系统总体参数设计流程；最后给出了一个运行在2.4GHz的系统参数设计实例，并用Matlab和ADS进行了系统级的仿真验证和分析，说明了系统方案的可行性，为下一步的硬件实现打下基础。

Abstract:

Starting from the point of system analysis and design, this paper present a typical system structure chart based on the Airborne Synthetic Aperture Radar (SAR) system under the frequency modulated continuous wave (FMCW) model characters. And focus on the resolution, swath width and data storage rate, then introduces a simple design methodology. Proceeding with the parameters decomposition, the method revolves around three important problems: feed-through suppression, the large data storage rate and determining transmitted power. In addition, a system operating at 2.4GHz is presented, a set of parameters have been listed and simulated with Advanced Design System (ADS).